schumacher



J. SCHUMACHER.

PLASTER BOARD AND METHOD OF MAKING SAME. APPLICATEON FILED DEC 22, 1919 5 SNEETSSHEET l- J. SCHUMACHER.

PLASTER BOAR D AND METHOD OF MAKJNG SAME.

APPLICATION FILED 0E6. 22,1919.

Patented Sept. 7, 1920.

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FLASTER B Patented Sept. 7, 1920.

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PLASTiR BOARD AND METHOD OF MAKING SAME. APPLICATION FILED Dc.22,1919.

1 ,352,390. PatenmdSept. 7 1920.

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Specification of Letters Patent.

Patented Sept. 7, 1920.

Application filed December 22, 1918. Serial No. 346,534.

To all whom. it may concern.-

Be it known that I, J 01m ScnUMAo'HEn, a citizen of the United States residing at Los Angles in the county of. 1 40s Angeles and State of California, have invented new and useful Improvements in Plaster-Board and Methods of Making Same, of which the following is a specification.

This invention relates to an improved plaster board for buildinglconstruction, and a method of producing t e same. The invention pertains partlcularly to a board formed of plaster incased in a covering sheet.

It is an object of this invention to provide a substantial and durable plaster board which will withstand the rough usage 0 handling. It is another object of this invention to provide an article of the character described, in which the plaster is incased in a sin 1e integral covering sheet. Processes have een heretofore employed in which plaster board has been made continuously by ieeding two covering sheets and interposin therebetween plaster material. It is a sti further object of this invention to provide a process, whereby a sin le flat covering sheet is, continuously fol ed to form a top and bottom covering, and a plas tic substance interposed therebetween.

I accomplish the above mentioned objects as well as other objects and corresponding accomplishments by means of the boardillustratedin the accompanying drawings, and. the means for carrjunglout the process for producing said board 1 ustrated therein.

Figure 1 is a front elevation of a complete machine for forming plaster hoard, some of the supporting frame work not being shown in order to more clearly illustrate the invention; Fig. 2 is a secjjon taken on the line 2-2 of Fig. 1- Fig. 3 is a section taken on the line 3-3 of F enlarged section of the creasing r01 er taken ongthe line 4-4 of Fig. 2; Fig. 4"1s a section through a' modified form of creasing roller; Fig. 5 is an enlarged section taken on the line 5-5 of Fig. 2 showing the switch and severing'mechanlsm; Fig. 6 1s a view similar to F1g. 5 showing the switch in another position; Fig. 7 is an enlarged,

side view of the switch as seen from one side indicated b the arrow 7 in'Fig. 2; Fig. 8 is a view coking at the switch operating mechanism from the opposite Slide 1ndicated by the arrow Bin Fig. 2; Fig. 9 1S naled crease.

a section through the detent lock on an enlar ed scale, taken on the line 9-9 of Fig. 2; 1g. 10 is a vertical section through a EOI'MOIl of the cars for receiving the severed oard illustrating a means of moving the same Fig. 11 is an enlarged section on the line 1 111 of F1g. 10; and Fi 12 is a rspective view of a portion 0 the finis ed board.

Referring more particularly to Figs. 1 and 2,.a machine is shown in which the plaster. board advances vertically from a opper indicated generally by A. A switch and severing mechanism for cutting the board into lengths and piling it on the cars is indicated generall by B. Cars for receiving the severed board and mechanism for operating the same are indicated by C. These cars carry trays for receiving the plaster board as it emerges from the machine and is severed.

Referring more specifically to the hopper mechanism, a frame supporting the vanous parts of the machine 1s indicated by 13. A roll of paper used for the covering sheet is indicated by 14. The web of the roll is led overa creasing roller 15 jam in the frame and downwardly to a folder later described. Pivotally mounted upon the frame adjacent the roller is a yoke 16, in which is journaled a creaser 17 for hearing on the paper. Referring particularly to Fig. 4 which shows a section through the creaser 17, annular ribs 18 are formed at the center of the creasing roller 15. The creaser 17 is resilient and rides on the to of the ribs, so that the pa or is crease at the oint where it will be f lded. A weight 19 is mounted u on such a manner that it may e a justed and exerts ressure upon the ereaser suflicicntto proper crease the paper. Instead of the form 0 creasing mechanism just described, the form shown in Fig. 4 ma be used. In this form the creaser 17 an okc are dispensed with and the tension of t e paper bearing on the ribs is depended upon to The web of paper is led downwardly from the roller 15 and into a folder 20, the creased portion of the paper advancing to the point 21 and between comin communication with the receptacle fOl" the wet plaster composition. A guard 26 is placed on the exposed edge of the unfinished plaster board as it emerges from between the compression rollers and is ad'usted as to position by means of a threa ed shaft and hand wheel indicated by 27. The compression rollers 22 and 23 are positively driven, the shaft of compression roller 22 extended and having a drive pulley tween guides 32 and 33 mounted upon the frame work 13. As the board emerges from the guides, it is severed by a wire cutter. A. tapering switch member 34 with the apex pointing upwardly has curved faces 35 and 36, as best shown in Figs. 5 and 6. Extensions 37 are formed on the base of the switch, and a shaft 38 fixed thereto. Secured to the shaft on one side is a segmental gear 39, see Figs. 1 and 8. This gear meshes with a pinion 40 mounted upon a shaft 41 secured b0 the frame. Enga in shaft 41 is a detent indicated generaliy )y 42 and shown particularly in Fig. 9. The shaft has two recesses 43 and 44 formed in 21 peripheral groove, and mounted in the groove for engagement with the recesses is a spring pressed pin 45 tending to lock the shaft 41 and pinion 40 in positions at 90 to each other. By reason of the segmental gear 39. switch 34 is thus locked. The ratio of gears is such that the switch looks either in the position shown in Fig. 5 or that shown in ig. 6. The switch is moved against the operation of the detent by the mechanism best shown in Figs. 1 and 7. Secured to shaft 38 are arms 46 and 47. Pivotally mounted upon shaft 38 is a member having three arms 48, 49, and 50. Secured between arm 48 and arm 47 is a tension spring 5L, and secured between arm 48 and arm 46 is a tension spring 52. The three arm memher is rocked by movement of the cars and snaps the switch 34 from one position to the other. When it is moved. it exerts spring tension upon the arm 48. until sufiiricnt to overcome the resistance of the detent 42. whes-eupoh the switch is moved. Mounted upon that *nds of arms 4%) and 50 are rollers .13 md 54, which are disposed to be engaged by inclined m mbers disposed upon the is of the cars. The inclined members are indicated by and 56 and their inclination is toward one another. As the cars are re ciprocated and the ends thereof approach the rollers on the arms 4 and 5t), the latter downward and is guided will ride upon the inclines and rock the switch. Thus, in the position shown in Fi 7, roller 54 is riding onincline 55, and wi 1 move the three arm member to rock the switch 34, so that its apex is on the other side of the central axis of the bers 32 and .At the same instant that the switch is rocked, the board is severed. Mounted upon 0 posite end faces of the switch are arms 5 and strung between the arms a severing wire 58 This wire is adapted to he passed through the board severing the same. Referring to Fig. 5, if the switch is rocked to the position shown in Fig. 6, the wire will sever the board, and the latter emerging from between the guides will move down over the face 36 of the switch and have the severed end .laid upon the pile of boards indicated by 59 with the severed ends in registry. The reverse operation occurs as the other end of the cars approach the switch. The cars are moved at a speed .rorresponding to the speed of the advancing board.

Depending from the cars is a bracket 60 having a slot 61. Disposed in the slot is a pin 62 mounted upon an endless sprocket chain 63, best shown in Figs. 1 and 10. Sprocket chain 63 passes over a driving sprocket Wheel Gel mounted upon a driving shaft 65 as shown in Fig. 2. The sprocket chain passes over an idle sprocket wheel at the other end of the travel of the cars. Secured to shaft 65 is a sprocket wheel over which passes a chain 66. Chain 66 passes over a sprocket wheel 67 mounted upon the shaft of compression roller 22.

Mounted upon the other end of the shaft of compression roller 22 is a bevel gear 68, which meshes with n bevel gear 69 fixed to a shafti'O. Mounted upon shaft 70 is a sprocket wheel over which a chain 71 is passed in gear with a sprocket wheel on the shaft of roller 15. Thus, roller 15 is positively driven at a speed corresponding to the other parts. i

Paper is fed from the roll 1-1, is creased by the creaser 17, and folded by the compression rollers 22 and 23. Plaster material in its plastic state is fed from spout 25, and the unfinished board emerges from between the compression rollersns indicated b 31. While the board is advancing, cars (J are reciprocatcd -and the switch and severing mechanism operated. Initial lengths 0? board are cut and piled upon the trays on the cars.

The finished board is shown in Fig. 12. It comprises a single piece of covering materini folded to form an upper covering 73 and a lower covering H with one edgeof the plaster loard covered as indicated by 75. The other edge is exposed. This provides a board having only one exposed edge,

the other edge being straight and true, and

uide memrequiring no trimming. The completed board has a smooth edge, a finished a pearance, and cannot eel or tear at the e go 75.

While I have s IOWIl a specific means for carrying out my process, yet this is onl one of various devices which ma be used. My process is in no way limited to the particular machine shown,

\Vhat I claim is:

1. The method of making plaster board which consists in advancing a single sheet of corering material, folding said sheet intermediate the ends thereof to form parallel covers, and interposing plastic material between said covers.

2. The method of making plaster board. which consists in advancing a single sheet of covering material, folding said sheet intermediate the ends thereof to form parallel covers, and flowing plastic material between said covers While the latter is being folded.

3. The method of making plaster board which consists in advancing a single sheet of covering material, folding said sheet intermediate the ends to form parallel covers, flowing plastic material between said covers while the latter is being folded, and compressing said board to form parallel faces.

4. The method of making plaster board which consists in advancing a single sheet of covering material, foldin said sheet to form a hopper, and flowing p astic material into said hopper.

The method of making plaster board which consists in advancing a single sheet of covering material, falding said sheet to form a hopper, flowing plastic material into said hopper, and compressing said board to form )arallel faces.

JOHN SCHUMACHER. 

